Charge HTTP logging to separate child logger of each service

Unfortunately log filters only apply to each logger, not to its
children, so we have to make sure the http child loggers has the
same password filter as the root base filter.

pyicloud/base.py

@@ -57,7 +57,9 @@ class PyiCloudSession(requests.Session):
         # Charge logging to the right service endpoint
         callee = inspect.stack()[2]
         module = inspect.getmodule(callee[0])
-        logger = logging.getLogger(module.__name__)
+        logger = logging.getLogger(module.__name__).getChild('http')
+        if self.service._password_filter not in logger.filters:
+            logger.addFilter(self.service._password_filter)
 
         logger.debug("%s %s %s", args[0], args[1], kwargs.get('data', ''))
 
@@ -116,7 +118,9 @@ class PyiCloudService(object):
         self.data = {}
         self.client_id = str(uuid.uuid1()).upper()
         self.user = {'apple_id': apple_id, 'password': password}
-        logger.addFilter(PyiCloudPasswordFilter(password))
+
+        self._password_filter = PyiCloudPasswordFilter(password)
+        logger.addFilter(self._password_filter)
 
         self._home_endpoint = 'https://www.icloud.com'
         self._setup_endpoint = 'https://setup.icloud.com/setup/ws/1'